Umbrella



FIG. 1 is a front view showing the umbrella;

FIG. 2 is a back view of the umbrella;

FIG. 3 is a right side view of the umbrella;

FIG. 4 is a left side view of the umbrella;

FIG. 5 is a top view of the umbrella;

FIG. 6 is a bottom view of the umbrella; and,

FIG. 7 is a perspective view of the umbrella. 

CLAIM The ornamental design for an umbrella, as shown and described. 